Sounds like I have a lot to learn about what exactly I can put through this rifles barrel safely ....thanks for the heads up all!
For the Garand newbs, the issue with ammo is that the Garand was developed using faster burning powders than are typical today. Using factory ammo with slower burning powders results in higher pressures in the gas system than the M1 was designed for and this can damage parts and is generally hard on the rifle. There are two ways around this:
1) Hand load ammo using the correct bullets (150gr FMJ or 165-168gr. match bullets) and correct powders (IMR4064 and IMR4895) that will give the correct pressures for the gas system. This is a good option because ammo is expensive and you are going to shoot a lot of it with a great rifle like the Garand. Reloading at least lets you minimize the costs of enjoying the M1.
2) Buy a Schuster or McCann gas plug that lets you shoot commercial ammo with safe pressures in the gas system. Both are essentially vented gas plugs that bleed off the excess pressure from the commercial ammo to keep operating pressures at safe levels for the gas system.
The M2 ball ammo used by the US Army in the Garand put a 150gr. FMJ bullet out at 2750fps and that is the load to duplicate.
I bought my Schuster gas plug at Creedmore Sports. They are in California and had good service. Shipping was a touch slow, but they were very good at answering questions and helpful with my order. They also offer National Match sights (a huge improvement over the battle sights), 2 and 5 round en bloc clips (I bought some 5 rounders for hunting next year) and other goodies for the M1/M14 family of rifles.
creedmoorsports.com
If anybody wants more info on the handloads, shoot me a PM.
Mark